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Creating a New Database
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As I mentioned at the beginning of the chapter, you have several ways to create an Oracle database. One way is to have Oracle create a database for you as part of the server software installation. You simply choose the installation option to create a new database, and Oracle will lead you through the necessary steps to configure a database. Alternatively, you can use the DBCA to create a new database. In this section, I show you how to create a new database from scratch, using individual database creation statements. Of course, if you are familiar with the database creation process, you don t have to run these SQL statements one by one just create a script with all the necessary statements, and simply execute the script from SQL*Plus.
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You can use the SQL*Plus interface to create the database, either directly from a workstation or through a terminal connected to the server where you want to create the database. Before you log into the SQL*Plus session, however, you will need to set some environment variables at the operating system level.
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CHAPTER 9 CREATING AN ORACLE DATABASE
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First, make sure ORACLE_HOME is set for the session you log into. The ORACLE_HOME environment variable in Oracle Database 10g databases is in the following format: $ORACLE_BASE/product/10.2.0/db_1 You can thus set your ORACLE_HOME as in the following example: $ export ORACLE_HOME=/u01/app/oracle/product/10.2.0/db_1 Second, set the Oracle system identifier (ORACLE_SID) for your database to uniquely identify your database. This value will be the same as your DB_NAME initialization parameter value (which in this example is nina). $ export ORACLE_SID=nina Finally, make sure you set the LD_LIBRARY_PATH variable as shown here: $ export LD_LIBRARY_PATH=$ORACLE_HOME/lib
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Ensuring You Have the Privileges to Create Databases
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Every Oracle database has a set of default administrative users to manage the database or to monitor various components of the database. Of these default users, two are special because their accounts can be used to perform most of the database administrative tasks. They are the SYS and SYSTEM accounts. The default password for SYS is change_on_install and the password for the SYSTEM account is manager. You can specify passwords for these two critical accounts as part of your database creation process, as you ll see shortly. In addition to the two administrative user accounts, most types of Oracle databases come with several other default accounts, usually with default passwords. (See the Changing the Passwords for the Default Users section later in this chapter to learn how to ensure that you change all the default passwords.) All users except SYS need to be explicitly granted high-level privileges before they can perform special administrative functions, such as creating databases and starting, stopping, and backing them up. The SYSDBA privilege will allow a user to create databases. The interesting thing about the SYSDBA privilege is that you don t really need to have the database open or even have a database before you can invoke it. Before you create the database, you ll be creating the instance (SGA + Oracle processes), and the SYSDBA privilege is in effect even at the instance level. You ll be connecting to the database as the super user SYS with the SYSDBA privilege, as shown here: SQL> CONNECT sys AS sysdba If the system administrator sets the oracle user to be part of a special group called DBA in the /etc/group file, you can also use the following command to log in as user SYS with the SYSDBA privilege: SQL> CONNECT / AS sysdba
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Creating the init.ora File
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Before you can start the Oracle instance, you first must create the initialization parameter file (init.ora). Once you create the instance, you can create an SPFILE from your init.ora file. As you will recall, an Oracle instance consists of certain Oracle background processes and Oracle memory.
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